and then for son-in-law reason, he tells me this is dzhokhar and tamerlan, and points at the screen and says here is tamerlan in the blue jacket and dzhokhar in the white jacket. and i say anzor, these are guys with the backpack when the photos are shown. it can't be them. he says i don't know, these are my children. and then his wife grabs the tv screen and starts screaming, i can't be, it can't be happening. i don't believe it. the children are dead. i would have cried out myself. >> reporter: nick walsh, cnn. >>> it was russia that asked the fbi to look into tamerlan tsarnaev's activities back in 2011. moscow said the older brother was increasingly turning to radical islam. bill black joins us now live from moscow where it is 9:36 in the morning. phil, the chronology of this may surprise people, because it seems that the return to radical islam, the request from moscow came before he traveled back to his ancestral homeland. is that the word you're hearing from russian officials, that they were worried even before they let him back in the country? >> reporter: it's what the chronology